Low Sulphated Ash Lubricating Oil Composition

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a need for automotive lubricating oil compositions with low sulphated ash levels that can extend the drain interval without compromising engine durability or performance, while meeting stringent environmental and pollution control requirements.

Innovation Solution

A lubricating oil composition with a combination of overbased magnesium salicylate detergent and ashless alkylene bis(dihydrocarbyldithiocarbamate additives, which maintains low sulphated ash levels while extending the time to reach the TBN/TAN cross-over point, thereby prolonging the drain interval.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If metal-containing detergents are reduced to meet low sulphated ash requirements, then environmental compatibility improves, but acid neutralization capacity deteriorates

Engineering Contradiction:

Improvesulphated ash levelVSAvoidacid neutralization capacity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by using overbased magnesium salicylate detergent with high TBN (≥220 mg/g KOH) to maintain acid neutralization capacity while keeping sulphated ash at low levels (≤1.0 mass %). This parameter change allows simultaneous achievement of low ash requirements and adequate neutralization capacity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite additive system combining overbased magnesium salicylate detergent with ashless alkylene bis(dihydrocarbyldithiocarbamate) additives. This composite approach provides both detergency and acid neutralization functions while maintaining low sulphated ash levels, resolving the contradiction between environmental requirements and performance

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If detergent overbasing is reduced to meet ash constraints, then sulphated ash level improves, but drain interval deteriorates

Engineering Contradiction:

Improvesulphated ash levelVSAvoiddrain interval

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of moving object

Solution Approach 1:

The patent uses overbased magnesium salicylate detergent with exceptionally high TBN (≥220 mg/g KOH) to extend the time to reach TBN/TAN cross-over point. This parameter change in base number allows the lubricant to maintain neutralization capacity throughout an extended drain interval while keeping sulphated ash at low levels (≤1.0 mass %)

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The high TBN overbased detergent provides continuous acid neutralization capacity throughout the extended drain interval, ensuring the lubricant maintains its protective function for longer periods. This continuous effective action extends the drain interval while meeting low ash specifications

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentEP2913384B1A lubricating oil composition

Publication Date: 2017.03.15 INFINEUM INT LTD

AI summary

A low sulphated ash lubricating oil composition comprising an overbased magnesium salicylate detergent and an ashless alkylene bis(dihydrocarbyldithiocarbamate) which exhibits an extended drain interval.